Selector switch amd connection



Nov. 27 1923.

F. A. LUNDQUIST SELECTOR SWITCH AND commc'rrou Original Filed Aug. 21,1918 4 Sheets-Sheet 1 17220127220 2: 1 fian/i .Lu zzwt dgwgmag 1 fi Nov.27 I923 1,475,500

F. A. LUNDQUIST 7 SELECTOR SWITCH AND CONNECTION Original Filed Aug. 21,1918 4 Sheets-Sheet 2 "Nov. 27, 1923, 1,475,500

V F. A. LUNDQUIST A SELECTOR SWITCH AND CONNECTION Original Filed Aug.21. 1918 4 Sheets-Sheet 3 ii :9 w" Us 1:6 Q1

5 7 R 1 I 6 TE 3 [Q to laden/Z 57 wine/a5 Fan/L HZLUZCZQLZZSZT OriginalFiled Aug. 21, 191B 4'Shaets-Shaat 4 Patented Nov. 27, 1923.

UNITED STATES FRANK A. LUNDQUIST, OF CHICAGO, ILLINOIS, ASSIGNOB, BYMESNE TO-HENBY S.'CCNRAD, TRUSTEEIE PATENT OFFICE.I 4

ASSIGNMENTS,

snnnc'ron swi'rcH AND connncrlon.

- Application filed August 21 1918, Serial No. 2 50,373. ma w a 1 3m'19, i223.

1 all whom'it may concern:

Be it known that I, FRANK A.' Lonnqmsrf'a citizen of the United Statesof America, and a resident of Chicago, county 5 of Cook, and State ofIllinois, have invented certain new and useful Improvements in SelectorSwitches and Connections, of which the following is a s ecification.

My invention relates to selector switches and connections therefor, andhas for its object improvements in the construction and operation ofautomatic telephone exchanges.

In the accompanying drawings Fig. l is a, side elevation of the switch;Figs. 2, 3 and 4 are sections onflines corres ondingly marked on'Fig. 1;p

*igs. 5, 6, 7 and 8 are details of parts of theswitchy p r Fig. 9 is asection of a typical pneumatic motor ofyvhich there are several ofdifierent sizes in the switch;

Fig. 10 is asection of the valve arrangement used; in controlling theadmission of air,to the,motor; and I 2 f Fig.'11'- .a' diagram of theswitch and so m ich of ,thefelectrical connections as is toanunderstanding of the present i hi ie to Fig. 9-, the motor used is ocomposed olfai. stationary standard 15having'an axialopening 16, and, atube 17 which fitsover. and slide s.on the standard A pipe: 18compressed air between the top bf the standardl5 and the closd'head ofrises and serves to move any obj ect'connected to it! When theadmittedair is permittedto escape,,the tube 17 returnstononn'al position,bygQthe action. of gravity or. spring.

There are four motors of this type mthc present switch. They all operateon the same principle, butdifi'er from each other in details; They willbe referred to b characters applied to the moving tube.

I In Fig. 10 there is shown a casing 19 in which are valves 20 and 21.The valve 20 1 normally rests on its seat and revents compressedairflowing in the direction indicated by the arrows. Valve 21 has aprojecting stem 22 adapted to be engaged by an armatnre lever 23 or byany other device to lift said valve and press it against its seat. Thevalves have ns 2% and 25 projecting toward cachcthsr and so arranged atif armature23 lifts valve21 to its seat, "alve 20 will be lifted fromits seat and r it air to flow to pipe 18, which is the ame pipe as thatshown in Fig. 9; In theiwords, when an armature lifts the valves in acasing like 19, compressed air iows thru a pipe ike 18 to operate amotor like 17. hen the armature falls, the air in the motor ispermitted'to escape by passing around valve 21 and its stem to' outsidesoace. The valves in this switching mechao5 msm will be referred to bythe casings which contain them. i l I The frame 'ofthe switch iscomposed of a bottom bar 26, a top bar 2fl; and endlbars .28 and 29."Near the centralfpartfof thi's'70 frame is a vertically movabl'motolBOpliedwith. compressed airfg'thrn "a 31 and controlledbyvalvesiffi'easing 32; The motor'fit) hason ita icker): adapted beengaged by a pawl f34foi1ithejdclsliaft 35. The teeth ofrack'33'aresoarranged'thatf the pawl 34 will suppdrt tliefmotor'30 inits elevatedposition after: the air whichmo ves it h s been P rmit do es ap -1 5 Z-onl ow' 03 sn hetmk 36 r cl s its teeth facing;, inj the oppositedirection fromf tho's'e 'of 33f pawl"? 'on'iock h -W38 isl s h df. g "Jhit fl i rack 36' tojfsto'pf-th'"'jlpv'wrar of; motorBO under th'oiifofcomp l egsd aiii; B5 A spring 39 acts bl'l 4o'. i fi' pav r1 3710normally hold said pawl ffi oni engagement withii aclr" 36,? as Trimm r.O' n i d' carried'i'n a frame 41 whichiis secnredto the outer end at ahorizontahfiotoif The motor 4-2 is operated by compressed ziiifcomingthriip pes43'and44' valve casing The roller 54 running on track 55supports the weight of the parts on the outer end of the motor 423Secured to the top of motor 30 are arms 6 56 and 57-,-: and on thesearms are insulated wipers 58, 59, 60 and 61 adapted to engage hankcontacts shown in the upper part of Fig. 11. When motor 42 and magnet 53act to move motor 30 to the right, the wipers are advanced 'ste'p b stepto successive posi' tiop s under vertica rows of contacts, and when"when'smotor 3Q acts; the wipers, are moved "iipivard' to successiveengagement with contacts in pre-sele'ctedrows.

o (fi ieiti gma mi ath c wa roller cshr -anged'ito be, :e, lgedhyt-hteeth of ilieescape wheel semen thaigwheel rotates. When" such.enga'g'eifient the teeth of wheel 50 vibrate ar'xii'itfi to open andclose whenjth'eg iiotoig 42? is. jnorxhal posi tion, a 'pin'66 onsaid"mo tor"ep'g.ags arm '62 to lift roller ear ;of-,wh'eel5b"and 2 hbidsgri spa an in electrical connec 4 tion w thpach'otherl 'But when motor4-2 e sg 'idmna the peh he p n 4 leaves the arm. ,62 l and "rollerfiliialls to ene ent with? the teeth of wheelf 50.

two pavilsjfis; an ,6 .irranged to engage a. stationary "atcl iet'ffliholtedto'end bar 28.

engagesthe tail "efpawrea e ho'l jsaid pawl 3 away'fromratchet' '7flwhen'tBemomr is in .itslowerpr normal posi' ionq But upon then-motor lnojvin'g upward, the lpr'o'e'ction 71' leaves the. tail "of pawl 69 and'sai pawl becom's. free to engageratchet 70.'- The tail of the ,pawl68is1normally engaged by a bar 72 secured to the; of ash'ort strokemotor 73.sup lied with compressed air thru a pipe 74. EVhen the tail ofpawl 68 is thus engaged, said pawl is held out of etigagement withratchet 70, but when the motor 73 operates to lift bar 72, pawl 68 fallsinto engagementwith ratchet 70.

Shown at the lower ri ht hand part of Fig. 1 is the apparatus wiichcompose the motor switch of the selector. This switch has some of thecharacteristics of the well known side-switch but is here called a motorswitch because its most-important functions involve the control ofmotorseither directly thru a valve or indirectly thru magnetic devices.The stationary contacts of'the motor switch are secured to a bracket 75'carried on the end bar 29. The wipers of the .motor switch are securedon an irregular disk 76 pivoted at 77 to a plate 78 fast to the end bar29.

Pivoted at 79 on plate 78 is a hell crank lever 80 which has one endrestingon top of motor 81 and has on its other end a pawl 52 (Fig. 6)arranged to engage teeth on the "Pivotedto a brac' t on th' endbar 28lower part of disk 76 to turn said disk on its pivot and thus shift themotor switch wipers from one set of stationary contacts to the next.

livoted at 83 is a pawl 8": arranged to engage teeth.- in the upper partof disk 76 and hold it in its advanced position when moved by motor 81acting thru lever anal pawl82. The pawl 84 is connected by a rod 85 to abracket 86secu1edto thbshaft 3:). The shaft 35 has a small lon itudinalmovement as representedby the collars 87 on'each side of the end plate29 as shown inF 1i Thepawl 34 is not connecteddirectly to thefshaftfiobut to a" sleeve SSfwhich is slidable pn said shaft and is conneeted'to"frame il Attabhed to lthe gear48" is a case 89 in whichisanordinary'cloek spririgacting;t0 return the motor42fto1norma'l'position'when air is exhausted therefrom In such return,the awl-341 strikes a small collar 90 'onfth'e en'd jof 35 to 1 movesaid shaft to the left; longitudinal movement acts thru bracket 86'andrqdSfi to lift pawl 84: from engagement with" the teeth in the upper'part'of disk 76: When mptor 42 movesfromits normal position, the sleeve88' slides on shaft to .car1'y pawl 34 away from collar 90,andsprir'i'gfil actingl on pawl 84: moves the shaft 35 to the right andpermits said pawl to engage the teeth on disk 76. f

A small'Jnotor 92 has an upwardly projecting rod 93 on which is acollar'94 which is. in contact with the upperface of an arm 95 onbracket- 86 (Fig. 7); A spring 96 on another part of the bracket acts tohold collar 94 and arm 95 in engagement with each other. Theconstruction is such that when compressed air is supplied to the motor92, the shaft 35 is rocked to cause pawl 34 to engage the teeth of rack33. Whennir is exhausted from motor 92, the-shaft moves in the op'osite'direction to release pawl 34 from ract 33.

On the hell crank 80 is air arm 97 which cxtends'np tovalve casing 32.\Vhcn the hell crank is in its normal position thearin 97 acts to openthe valve so that-compressed air can flow thru casing 32'and pipe 31 tomotor 30. When the motor 81 acts to more bell crank 80, then the valvecloses in casing; 32 to shut off the supplyjto' motor 30.

Pivoted atja convenient place near the motor switch is a lever 98, onearm of which engages the. stem of the valve in casing 99. A springpresses the lever 98 against the pin of valve in casing 99 so as tonormally holdsaid valve open and permit compressed air to flow thrucasing 99 and pipe 101 to casing 32. On one of the motor switch wipersis a projection 102 ada ted to engage the other arm of lever 98 hen themotor switch is in either its normal or its second position, theprojection 102 is clear 01 lever 98, but when the motor switch reachesits third or final position the projection 102 engages lever 98 to moveit away from the pin of valve in casing 99 and permit said valve toclose.

Secured to the upper bar 27 is a slow magnet 103 whose armature 104 ison the shaft 38. When the magnet 103 is ener gized it rocks the shaft 38to move pawl 37 into engagement with rack 36, and also to cause arm 46to open valve in casing 45. Because magnet 103 is slow it holds itsarmature attracted during the sending of im pulses due to operating thecalling deviceat a local station.

Supported on the frame of the switch or at some other convenient placeis a relay 105 (Fig. 11) which has two armatures and combines withinitself and connected parts all of the functions of fast and slow linerelays. Adjacent to the relay 105 is a valve casing 106, the valve stemof which bears against the armature 107 to hold it in its retractedposition by reason of compressed air. froma source or general supplyentering the other end. of the casing and acting to hold the valveclosed. A spring 108 acts tohold the armature 107 againstthe valve stem,but theforce of this spring. is a little less than that required to openthe valve. When the magnet is energized it attracts the armature 107 toopen the valve in casing 106 and permit air; to1flow to pipe 109. Afterthe armatureisattracted, the circuit thru' magnet 105 may bebroken andremade under the conditionsjised in ordinary calling device operations.:-:In other words, the va ein casing 106 and-the e ring 108 act to makerelay 105-a slow re armature;107 is concerned.

The armature 110:has;no such connections to it, and consequently resonds to ordinary impulses sent thru 105. elay 105 is a fast relayasv.far as armature llO is concerned.

The subscriber at his local station is con nected by line wires to aline switch atthe central office. 1 w r 1, A

By the operations of his line switch theisubscriher has his line wiresextended to lines 117 and 118 to this switch. Hence, wires 117 and 118become line wires leading to'a'local station and over which the.subscriber may send impulses by operating his calling device. The firstcircuit :coming to this switch comes to line 111 and then continues thrul12contact arm 113--114-115 to battery X. Battery'X is a. commonbattery, and the circuit just givenin part starts from the other side'ofthis battery and goes thru a magnet on the line switch to connect thelines 117 and 118 to the local station. This circuit belongs tothe-lineswitch and is referred to here only because part of it appear inthis switch.

lVhen a subscriber operates his calling ay as far as device after beingconnected to this switch a circuit is completed as follows: Battery-X-resistance 116-117 to local station and back over 118relay 105119X.

This circuit thru relay 105 attractsarmature 107 to open the main valve106 to permit compressed air to flow from the source to the local supplypipe 109. From pipe 109 air flows to motor 92 which rocks shaft so thatholding pawl 34 may fall into ratchet33. It also flows to motor 73'which lifts bar 72 so that holding pawl 68 may fall into ratchet 70.

When armature 107 was attracted it closed springs 120 and 121 to make anew circuit from the line switch over wire 122 to take the place of thecircuit over wire 111 which becomes broken at 112-l14 by the firstadvance of the motor switch. The closure of springs 120 and 121 alsoclose a circuit as fol lows: X120121-123-124slow magnot103-1251266564-127X.

The attraction of armature of magnet 103 tilts shaft 38 to open valvewhich permits air to how to the small quick motor 81 and to thehorizontal motor 42. Motor 42 can not operate as it is held byconnections to escape wheel and can move only when the magnet 53operates. But the motor 81 0perates on the bell crank 80 to shift themotor switch arms from normal position to the next. adjacent position,and also to permit the normally open valve 32 to close. When armature107 o ened valve 1062s before thru relay 105. One of the things doneis'adv l 10. would close a-circuit for the magnet'53 if ita vancing themotor switch one step. This were'not for the fact that the fast armature110 operates at the same time to open springs 128 and 129. But uponbreaking the circuit at the local station, armature 110 falls back and acircuit is completed as follows: X. 128129130-131-switch arm 132 -133-13453-123121120X.

Im pulses sent over this circuit operate the escapement to let the motor42 move the motor 30 and its connected wipers step by step to positionsunder successive rows of cont acts shown in the upper part of Fig.11.The number of steps the escapement makes is determined by the number ofimpulses.

which the subscriber at his local station sends by operating his callingdevice. Upon making the first step, the pm 66 leaves the arm 62 so thatroller 63 falls to contact with escape wheel 50 and opens contactsprings 64 and 65. Each tooth passing roller 63 closes these springs,but they are left open at the termination of the last step.

The springs" 64 and 65 are in the circuit torthe ma a slow ma et itsarmature remains attracted during the stepping of the escape ment. Butupon the stoppage of the motor 42, the open condition ofthese springspermanentl breaks this circuit thru magnet 103, an its armaturefalls-back to permitvalve 45 to close. p

The closure of valved? shuts the complessed air-from motors 42' and 81and opens *the exhaust; -Owing tothe fact that the pawl 68 hadprviously'eng'aged rachet 70,

the exhaust from motor 42 does not permit that motor to return to itsnormal position at this time. For 0 erativcu'rposes, a "check valve 43(Fig. I? is placed in the pipe 43 so as to cause the exhaust from motor42 to be gradual instead of sudden.

But the exhaust from 81 is immediate with the result that the bell crank80 falls back opens valve 32. .Vhen motor-42 made its first movementto'the right, the shaft 3fiand'connection 86 also movedto the righttop'ermit holding pawl 84 to fall into theupper teeth of disk 76. As aresult the finotor switch is held inits moved position aficr the bell'cra ik'SO- has fallen back.

Opening the valve 32 permits compressed air to'flow thru 109-99-101-32--31 to motcirf30. This starts the m'otor30 to carry itswip'ers'upward on atrunk hunting expedition. As in some well knownconstructions, idle trunkshave-battery connections to them sothatwhenthe wipers come to the bank terminals of such' a'trunk a current willflow as follows; Battery 'connection135-found contact point 13tr-Wipers59l25-magnet 103124--123- -121'120-battery X.

'Energizing magnet 103 tilts shaft 38 to throw'p'awl 37 in ratchet 36and stop motor 4 jwit-h its in contact with the found trunk. The tiltingof shaft38' also opens valve 45110 permit compressed air to flow tomotors42 and 81. Air flowing to motor 42 does nothing at this timebecause magnet. 53 does not} operate, but'motor 81 acts to shift thertiotor switch to its final position and to'perinit valve 32170 close.

The closureofvalve'32 permits air to exhaust from motor 30(but as theholding pawl 3 is inengagement with ratchet 33 by .reasonof compressedair being in motor 92, exhausting'air from motor 30 accomplis hesnot-hin at this time. The final movement'of the motor switch moves lever9850 that valve 99 may close and cut the su ly of air from valve 32.

en the wiper 59 came to engagement with the idle contact point 130, thewipers 60 and 61 came to contact points 137 and 65 138 connected toWires-139 and 140 leading ct 103, but as this is to the next switchwhich may be either a selector or a connector. At the time the motorswitch was shifted to its final position it connected the line wires 117and 118 to wipers 60 and 61 and hence to wires 139 and 140 so thatthereafter these wires become line wires leading back to the callinglocal station. The completed connections thru this switch are asfollows: 117-141- l4=2-arm l13143l4-l61-138-140;and 11Scontact pointsclosed by arm 132'- 1=l660137139.

W hen the wipers reach an idle trunk, the switch at the cm] of thattrunk (selector or connector) moves to break the battery connections to135. This breaks the circuit thru magnet 103 so that shaft 38 may returnto its normal position. This permits stopping pawl 37 to become freefrom ratchet'36, but as compressed air had previously been cut 015' frommotor 30, this a complishes nothing. 1

The return of the shaft 38 to itsnormal position lets valve 45 close tocut'ofi' compressed air from motors 42 and 81. Nothing happens at motor42 because pawl 68 is in engagement with ratchet by reason of comprcssedair being on motor 73. It should be noticed that pawl 69 is also inengage-mentwith ratchet 70 by reason of the fact that the upwardmovement of niotor 30 had lifted the projection 71 from the tail of pawl69. Pawl 69 will hold until motor 30 returns to normal pawl 68 has beenre eased by theexhaustof air from motor 73. This will appear later.

Cutting the air supply from motor 81 lets bell crank BOreturn tonormal-position and open valve 32.= But as valve 99 had been previouslyclosed 'by reason of the motor switch moving lever 98,"nothingresuitsfrom the opening of valve 32. And as pawl 84 is still in engagement withratchet 76, the motor switch is retained in its advanced position whenthe bell crank 80 falls back.

During subsequent operations inmakinga call, and during talking, therelay 105 is the only electrical device on this switch which continuesto receive current. 'By examining the circuits it will be seen that thisrelay is bridged between wires 117 and; 118, and that the circuit forthe relay will be broken when the calling subscriber breaks connectionbetween the wires by hanging up his receiver. Current flowing thru relay105 maintains its armature 107 attracted to hold open valve 106 and keepair pressure in pipe 109. Small motors 73 and 92 connected to this pipeare the only motors which take air pressure during talking.

When the calling subscriber. breaks the connection between 1 17 and 118,the armature 107 falls back so that valve IOS-may shut ofi the airsupply from 109. When this osition; which is after occurs motors 73 and92 fall back to normal osition. In doing this, bar 72 of motor 3 liftspawl 68 from ratchet 70, andmotor 92 permits pawl 34 to fall out ofratchet 33. Then this occurs motor 30 falls back to its lowest positionand causes projection 71 to release awl 69L -With pawls 68 and 69 bothreleased: the spring in case 89 returns motor 42 to normal position,carrying the parts in frame 41 with it." As these parts approach theirnormal position, pawl 34 strikes colhr 90 on shaft 35 to move said shaftto the left and release awl 84. When this occurs spring 76 ig. 63)returns the motor switch to its normal position.

For the purpose of making the neral operation more understandable, I wilgive a brief review of what has preceded.

The first impulse coming to this switching mechanism passes thru theline relay (magnet) 105 to attract its armature 107 so as to open valve106 andadmit compressed'air to the local supply pipe 109. As aconsequence of this, motors 73 and 92 are operated to bring the holdingpawls 68 and 34 into operative position. As motors 73 and 92 alwaysoperate simultaneously they may be considered as simply duplicaterepresentatives of the same thing in the same sense that the samebattery is frequently shown at. several places on the same-drawahe sameimpulse thru relay 105 also closes contacts 120-121 for magnet 108 whichin turn opens valve 45 and admits air from pipe 109 to motors 42 and 81.

The motor 81 closes valve. 32 so as to intercept the flow of air toinotor 30, and at the same time it shifts the motor switch to make a,circuit for magnet 53 so that other impulses thru relay 105 will causemagnet 53 to release motor 42 step by step.

When this stepping stops, circuit is broken for magnet 103 at springs6465, and valve 45 closes. This causes motor 81 to fall back so as toopen valve 32 and start motor 30 upward. When an idle trunk is found, anew circuit is completed for magnet 103 to again open valve 45 and causemotor 81 to again shift the motor switch.

Motors 42 and 30 are switch. moving motors. Motor 81 is a circuitshifting motor which also controls valves for motor 30. Motors 73 and 92are pawl motors.

The'motors herein described ma be made ver cheaply and will operate along time wit out attention or repairs if it is not necessary to fitthem accurately to prevent leakage. The valves herein described are ofthe self-closing type, and it is to be ob served that valve 106 isopened to admit compressed air to the local suppl pipe 109 cnlv' whenthe "switching mec anism is called into operation. At all other timesmagnet.

the valve 106 is closed and it is not possible for losses to occur bleakage when the switch is idle. During operation, com pressed air isadmitted to the main motors 42 and 30 only during brief intervals, andis continuously used only for pawls 34 and 8. Because of the valvearrangements, leakage at the motors becomes a negligible quantity.

W'hat I claim is: i

1. In a switching mechanism having power devices for moving parts of themechanism in directions perpendicular to each other, pawls designed tohold such movement when made but normall in inoperative positions,pneumatic devicesfor controlling the operative condition of said pawls,a valve for admitting compressed air to said pneumatic devices, and amagnetic device for controlling said valve.

2. Power devices for moving a switching mechanism, holding pawls,pneumatic de vices for bringing said pawls into operative position, andmeanstfor controllingthe flow of air to and from said penumatic devices.

3. A neumatic motor, an escapement for controlling the movements of saidmotor, a relay, and means by which saidrelay simultaneously controls the'operationsof said es- 5 capement motor.

4:. The combination with pneiimatic motor, and Ian fescapement by which,the

and the supply'of air said motor is fcontrolled, o;f a';relay,havingftwo armatures, meansby which on e; armature controls the supply orair tothh' motor,- and means by which the-other armature controls saidescapem'ent l 5-. A 1 1 5"p n pti r i t i ei 'ii 'd P su e, a e ma iecmeanaam ce arranged ,to permit air to lflow'hfrom thfe flpip'e to themotor, a magnet for'ogerating; the valve, an escapemengf or ,con,nolling-l the movementsof the, motor and meansgoper atingthru'istoppralige of escapeinept ,rnovements for hrea ng lcirp iit 'forjsaid 6. A pipe, a switch"op'erat i ng motor and other pneumatic devicesconnected -.to .said pipe, mea-ns for admitting compressed air to saidpipe so that it: ,mayflow tothe devices connected thereto', and t'neansoperated by the admitted air forintercepting the flow to the motorbefore said motor can operate.

7. In a switching mechanism, a pipe having branches leading toavplurality of. devices, means for admitting compressed air to saidpipe, andquiclr 'qperating meansin one branch for interce ting theflow-of com pressed air to another. ranch.,,

8. In a switching mechanism, electrical and pneumatic devices foroperatingsaid mechanism, a motor switch serving to control bothelectrical circuits and the flow of its i so

air to pneumatic devices, and a pneumatic motor for operating said motorswitch.

9. Inc switchingmechanism, a supply pipe, a valve for admittingcompressed air to said pipe, a pneumatic motor connected to, a branch ofsaid pipe,,a relay, and means by which a series of impulses flowing thrusaid relay will hold said valve open and control a step by step movementof said motor.

10. Wipers, a pneumaticmotor for moving said wipers, an escapement forcausing said. motor, to .make its movements step by step, a magnet foroperatin said escapement, and a,relay for control ing said magnetand thesupply of air to said motor.

11. Apneumatic motor, amagnet serving to open a communication forcompressed air to ,operatelthe motor, and an escapement controlling themovements oilthe mot-or and the circuitjornthe magnet.

12.;In a switching mechanism, a pneu matic motor for movingihe mechanismin one direc ion angle second pneumatic motor for moving- ;itjn' anotherdirection, a source of Q mP eSSed ,air havingconnections to bothmgtors,valvesin sa'id connections servinjg .to' lcontrol thes@ply;of airgto themotpi s a ma ,et hav ng ;an armatnre, and cans b v s ififchsng {in .thePOS Q of the co str e will. change the wive s a to shift the openconnection from onemotor to thectb or m 153 L iDHJ -Q i i.W PDQ" I...'at im ri sp t ds w h eenn e a. source of; compressed ,air, ivall'vesarranged t9 q itm the given nd closed, con ti n of saidcjfiiiect'eu iand, magnetarranged to alternately open and close Said alves,

131, In a,s vvitching mechjaniism, two pneum aticiprovided withconnections to s 'r iicomp sefljai fand, m gne rranged, to alternatelyopen and close said cnnnectipn's. V p

" 15$ In a'switchin mechanism. two pneumatic motors provi ed withconnections to es ur p s efl.-air,..= ma

ranged'to alternately open and close said connections, andmeansforcontrolling said .xnagnetlbythe pa'rtsmoyedby said motors. 16"I n asvvitchingmechani'sm, two pneumatic motors, a locally energiaedmagnetar- ',r to controllsaid rnotoi;s' so as to cause the'm'to operateinsuccession and means for controlling (said magnet from parts moved bysaid motors. A i i 1,7. In atelephoneexchange,the combination with syvitchingfmechanisrii, pneumatic unotors forlgperatinthe mechariism, asup- F y team ra li es fer.a i fii s r he mee the be eit m esp lvnormally cutting said supply pipe from a general sourceofgcornpressedain and electii iczil devices for opening said specialvalve,

flhe combinatipn with a'relay, and a pipe for conveying compressed air,to,pneu matic devices, of a valve controlling the supply of air to thepipe and the operations of the armature of the rela when electricalimpulses flow thru said re ay. 4

19. Ina switching mechanism operated by pneumatic devices and controlledby a relay. a valve serving when closed to cut the pneumatic devicesfrom a source of air pressure and serving when closed to control thearmature of said relay.

20. In a switching mechanism, wipers. pneumatic motors for moving saidwipersin directions perpendicular to each other, a supply pipe forsaidmotors, and means for connect ng said motors successively to saidsupply pipe.

21. In an automatic trunk selecting system, a pneumatic motor associatedvvitheach trunk, a source ,of compressed air, .au-

tomatic means controlled through',the.-, B-

lected trunk for admitting air to a ,inotor upon the selection of theassociated trunk.

22. In an automatic trunk selectingmys tem, a pneumatic motor associatedwithieach the selected trunkffor ,admittin'g arryto a m tor up n the selc i n, fAheo QQ ete u p p a 24. In ..a trunk selecting-system;switchingmechanism ,connected e trunk, a pneumatic; motorassociatedlwfii each switching mechanism. .or ;moy,iiig it from ,normalposition, ,a source ofiqompressed air, automatic means controlledthronghthe selected trunk for admitting ail'ji) a motor upon the selection ofthe associated trunk, and ,a restraining device for hglding' saidmechanism against movement ,by saidanotor. 25. In a trunk selectingsystem ,having a switching mechanism ;on teach t zun pneumatic means,foihmo ving (the switqhin mechanism, a 'SQUIGBqOf compri fised air gnautomatic means; controlled ,through ,the

selectedrtrnnk' ior applying the,ail;.,to move a mechanism upon theselection of themssociatedtrunks 26,,In a trunk cselect-in'g' systemahgin ,a switching .mechanism on pneumatic ,means for moving the switching7.

mechanisms, a source of compressed air, automatic means :controlledthrough the se'lected'trunk for applyin the air to, move a mechanismupon the se ection ,qflthassociatezl trunk, and a restraining device forholding the mechanism against such movement.

27. In a trunk selecting system having a switching mechanism on eachtrunk, automatic means controlled through the seleztcd trunk for puttinga strain upon a mechanism to more it from normal osition upon theselection of the associate trunk, and an escapexnent for controlling themovement due tosuch strain.

28. In a trunk selecting system having a switching mechanism on eachtrunk, automatic means for putting a strain upon a mechanism to move itfrom normal position upon the selection of the associated trunk, andmeans for controlling such movement from a distant station.

29. In a trunk selecting system having a switching mechanism on eachtrunk, automatic means for putting a strain upon a mechanism to move itfrom normal position when the associated trunk is selected, anescapement for controlling the movement due to such strain, and meansfor controlling the escapement from a distant station.

30. In a trunk selecting system having a switching mechanism on eachtrunk, a source of compressed air, automatic means for applying thepressure of the air to a. mechanism to move it when the associated trunkis selected, an escapement arranged to hold the mechanism againstmovement by the air pressure, and means for controlling said escapementby electrical impulses flowing over the selected trunk.

31. In a switching mechanism, a pneumatic motor, an escapement forpermitting said'motor to advance step by step, and a magnet operated byelectrical imp from 'a. distant station for controlling said escapement.

' 32. In a switching mechanism, a wiper carriage, a motor for movin saidcarriage, a rack and pinion for contro ling the move ment of Sfl-ldcarriage, and an escapement for controlling the rotation of the pinion.

33. In a switching mechanism, a wiper carriage, a motor for movin saidcarriage, a rack and inion for controlling the movement of saidcarriage, an escapement for 'iliary switch in swit controlling therotation of the pinion, and an elcctromagnet for controlling saidescapement.

34. In a switching mechanism, a wiper carriage, a pneumatic motor formoving said carriage, a rack and pinion for controlling the movement ofsald carriage, and an escapement for controlling the rotation of saidpinion.

35. In a switching mechanism, a wiper carriage, a. pneumatic device formovmg said carriage, a switch for controlling the electrical circuits ofsaid mechanism, and a pneumatic motor for controlling the operation ofsaid switch and said device.

36. In a switching mechanism, a wiper carriage, a pneumatic device formoving said carriage, a switch for controlling electrical circuits ofsaid mechanism, and a pneumatic motor which operates in one manner foroperating said switch and in another manner for controlling theoperation of said carria 37. In a switchmg mechanism, a wiper carriage,a pneumatic device for moving. said carriage, a switch for controllingelectrical circuits of said.,mechanism, a. penumatic motor whichoperates in one manner for operating said switch and in another mannerfor controlling the operation of said can'iagm and an electm ..niagnetfor. controlling the operation of said motor.

38. An automatic switch, a ratchet wheel for controlling the o erationof said switch, a magnet for controlling 'said switch a circuit forsaid'magnet, apairof rings in said circuit operated by 'saidlrata etwheel to control the circuit of said magnet' 39. In a telephone on;automatic switch, an incoming ltrimkl individual-;..-to

gets on "switch normally disconnected said. incoming means foroperating'said switch to select an idle one 0 said outgoing trunks, anauxfor connecting said wipers to said incor'niri trunk after said switchhas selected said i e trunlgand a. pneumatic device for controlling theoperation of said switch and said auxiliary switch. FRANK A. LUNDQUIST.

said switch,

ulses. said switch, outgoing-i trunks accessiblato

